/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 William D. Jones (thor0505@comcast.net),
 * Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de),
 * Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

#include "stm32f7xx_hal.h"
#include "bsp/board.h"
#include "board.h"

//--------------------------------------------------------------------+
// Forward USB interrupt events to TinyUSB IRQ Handler
//--------------------------------------------------------------------+
void OTG_FS_IRQHandler(void)
{
  tud_int_handler(0);
}

// Despite being call USB2_OTG
// OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
void OTG_HS_IRQHandler(void)
{
  tud_int_handler(1);
}

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM
//--------------------------------------------------------------------+

UART_HandleTypeDef UartHandle;

void board_init(void)
{
  board_clock_init();

  // Enable All GPIOs clocks
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();  // ULPI NXT
  __HAL_RCC_GPIOI_CLK_ENABLE();  // ULPI NXT

#ifdef __HAL_RCC_GPIOJ_CLK_ENABLE
  __HAL_RCC_GPIOJ_CLK_ENABLE();
#endif

  UART_CLK_EN();

#if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000);

#elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // Explicitly disable systick to prevent its ISR runs before scheduler start
  SysTick->CTRL &= ~1U;

  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
  NVIC_SetPriority(OTG_FS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
  NVIC_SetPriority(OTG_HS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
#endif

  GPIO_InitTypeDef  GPIO_InitStruct;

  // LED
  GPIO_InitStruct.Pin = LED_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);

  // Button
  GPIO_InitStruct.Pin = BUTTON_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);

  // Uart TX
  GPIO_InitStruct.Pin       = UART_TX_PIN;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = UART_GPIO_AF;
  HAL_GPIO_Init(UART_TX_PORT, &GPIO_InitStruct);

  // Uart RX
  GPIO_InitStruct.Pin       = UART_RX_PIN;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = UART_GPIO_AF;
  HAL_GPIO_Init(UART_RX_PORT, &GPIO_InitStruct);

  UartHandle.Instance          = UART_DEV;
  UartHandle.Init.BaudRate     = CFG_BOARD_UART_BAUDRATE;
  UartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits     = UART_STOPBITS_1;
  UartHandle.Init.Parity       = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode         = UART_MODE_TX_RX;
  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
  HAL_UART_Init(&UartHandle);

#if BOARD_TUD_RHPORT == 0
  // OTG_FS

  /* Configure DM DP Pins */
  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Configure OTG-FS ID pin */
  GPIO_InitStruct.Pin = GPIO_PIN_10;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

// Suppress warning caused by mcu driver
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif

  /* Enable USB FS Clocks */
  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

#if OTG_FS_VBUS_SENSE
  /* Configure VBUS Pin */
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // Enable VBUS sense (B device) via pin PA9
  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
#else
  // Disable VBUS sense (B device) via pin PA9
  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;

  // B-peripheral session valid override enable
  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
#endif // vbus sense

#else
  // OTG_HS

  #ifdef USB_HS_PHYC
  // MCU with built-in HS PHY such as F723, F733, F730

  /* Configure DM DP Pins */
  GPIO_InitStruct.Pin       = (GPIO_PIN_14 | GPIO_PIN_15);
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  // Enable HS VBUS sense (B device) via pin PB13
  USB_OTG_HS->GCCFG |= USB_OTG_GCCFG_VBDEN;

  /* Configure OTG-HS ID pin */
  GPIO_InitStruct.Pin       = GPIO_PIN_13;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  /* Enable PHYC Clocks */
  __HAL_RCC_OTGPHYC_CLK_ENABLE();

  #else
  // MUC with external ULPI PHY

  /* ULPI CLK */
  GPIO_InitStruct.Pin       = GPIO_PIN_5;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* ULPI D0 */
  GPIO_InitStruct.Pin       = GPIO_PIN_3;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* ULPI D1 D2 D3 D4 D5 D6 D7 */
  GPIO_InitStruct.Pin       = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_5;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* ULPI STP */
  GPIO_InitStruct.Pin       = GPIO_PIN_0 | GPIO_PIN_2;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /* NXT */
  GPIO_InitStruct.Pin       = GPIO_PIN_4;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);

  /* ULPI DIR */
  GPIO_InitStruct.Pin       = GPIO_PIN_11;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
  #endif // USB_HS_PHYC

  // Enable USB HS & ULPI Clocks
  __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
  __HAL_RCC_USB_OTG_HS_CLK_ENABLE();

#if OTG_HS_VBUS_SENSE
  #error OTG HS VBUS Sense enabled is not implemented
#else
  // No VBUS sense
  USB_OTG_HS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;

  // B-peripheral session valid override enable
  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
  USB_OTG_HS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
#endif

  // Force device mode
  USB_OTG_HS->GUSBCFG &= ~USB_OTG_GUSBCFG_FHMOD;
  USB_OTG_HS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;

#endif // BOARD_TUD_RHPORT

}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state)
{
  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
}

uint32_t board_button_read(void)
{
  return HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
}

int board_uart_read(uint8_t* buf, int len)
{
  (void) buf; (void) len;
  return 0;
}

int board_uart_write(void const * buf, int len)
{
  HAL_UART_Transmit(&UartHandle, (uint8_t*)(uintptr_t) buf, len, 0xffff);
  return len;
}

#if CFG_TUSB_OS  == OPT_OS_NONE
volatile uint32_t system_ticks = 0;
void SysTick_Handler (void)
{
  HAL_IncTick();
  system_ticks++;
}

uint32_t board_millis(void)
{
  return system_ticks;
}
#endif

void HardFault_Handler (void)
{
  __asm("BKPT #0\n");
}

// Required by __libc_init_array in startup code if we are compiling using
// -nostdlib/-nostartfiles.
void _init(void)
{

}